Lubrication System - Yanmar 4LHA-HTP Operation Manual

Chapter 5 Lubrication System

1. Lubrication System

1. Lubrication System
The lube oil in the oil pan is pumped up through the intake
filter and intake piping by the lube oil pump, through the holes
in the cylinder body and on to the discharge filter.
The lube oil which flows from the holes in the cylinder body
through the bracket to the oil element is filtered and sent to
the oil cooler. It returns from the oil cooler to the bracket, the
pressure is regulated, and it is fed back to the main gallery in
the cylinder body.
The lube oil which flows in the main gallery goes to the crank-
shaft journal, lubricates the crank pin from there and a portion
of the oil is fed to the camshaft bearings.
Oil is sent from the gear case camshaft bearing through the
4 L H A - H T E / H T Z E / H T P / H T Z P
C o n r o d
J Crank shaft
T
Oil gallery
Piston
O i l c o o l e r
j Regulator valve —
Oil filter
0.39±0.049(*±0.5I
MPalkgfteO
Safety valve"|-
Oil pump
!.226±0.098<12.5±1>
MPalkgf/cm)
Oil strainer
Rocker shaft
H Z
Cam shaft
J
T u r b o charger
| Safety valve
holes in the cylinder body and cylinder head to the valve arm
shaft to lubricate the valve arm and valves.
Oil is also sent from the main gallery to the piston cooling
nozzle to cool the piston surface, and is sent through the in-
termediate gear bearing (oil) holes to lubricate the intermedi-
ate gear bearings and respective gears.
Part of the lube oil is sent from the oil cooler discharge to the
supercharger in engines fitted with one, and is then piped
back from the supercharger to the oil pan.
4 L H A - D T E / D T Z E / D T P / D T Z P
4 L H A - S T E / S T Z E / S T P / S T Z P
C o n r o d
- | Crank shafT
I
Piston
| Regulator valve |—
0.39±0.0«9(«±0.5I
MPalkgf/cm)
| Safety valve j
1.226±0.098(12.S±1) •
MPatkgf/an'l
\
5-1
4LHA Serie
t
Rocker shaft
ZZZ
C a m shaft
Z J
Turbo-charger
Oil gallery
3 1
Oil cooler
I
Oil il f ilter | | Safety valve [
Oil p u m p (111 j O i l pump (2) I
O i l strainer
Oil strainer